In the stop-motion animated video “Blackboard War II,” uploaded by YouTube user Daiki Ikeda in 2011, a Japanese high school student attempts to clean a chalkboard while another student engages him in battle using all sorts of chalk-drawn characters. They then take the stop-motion war to the hallways as they fly around on brooms and leap through windows. This is sequel to their first stop-motion video, “Blackboard War,” from 2010.